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42175031ca
So far we needed it only locally here, but we will need calculating RR for safe unblinding in RSA as well. Signed-off-by: Janos Follath <janos.follath@arm.com>
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/**
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* Low level bignum functions
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#ifndef MBEDTLS_BIGNUM_INTERNAL_H
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#define MBEDTLS_BIGNUM_INTERNAL_H
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#include "mbedtls/bignum.h"
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/**
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* \brief Calculate the square of the Montgomery constant. (Needed
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* for conversion and operations in Montgomery form.)
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*
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* \param[out] X A pointer to the result of the calculation of
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* the square of the Montgomery constant:
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* 2^{2*n*biL} mod N.
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* \param[in] N Little-endian presentation of the modulus, which must be odd.
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*
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* \return 0 if successful.
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* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED if there is not enough space
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* to store the value of Montgomery constant squared.
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* \return #MBEDTLS_ERR_MPI_DIVISION_BY_ZERO if \p N modulus is zero.
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* \return #MBEDTLS_ERR_MPI_NEGATIVE_VALUE if \p N modulus is negative.
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*/
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int mbedtls_mpi_get_mont_r2_unsafe(mbedtls_mpi *X,
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const mbedtls_mpi *N);
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#endif /* MBEDTLS_BIGNUM_INTERNAL_H */
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